Unless your doctor as medical technical equipment "not feasible from Wheelchair" box, is nothing in the way of promotion.
The taxi-Holl standard wheelchair vehicles are Volkswagen Caddy with a special type of rear section and a ramp. This allows a wheelchair to be transported with up to four companions.
And stands for very large power wheelchairs or even a Mercedes Sprinter with up to four wheelchair spaces available. That all vehicles are air-conditioned, goes without saying Holl in taxi.